Technically if both Vegas NLE’s are on the same system they would share DLL’s and other files. On my system (Windows 7 x64) they are located here: C:Program Files (x86)SonyShared Plug-Ins.
The Other option, once you have made sure you Backed up your .veg files, etc. Is to perform a Vegas Reinstall from the Sony Setup folder under your Program Files folder (Depending on if you have x86 or x64) or the DVD if you have the media.
Is there an option to do a Repair of your Vegas Install?
I cannot provide which update would have caused you an issue, but in the recent past Microsoft Windows updates have caused various issues and removing an installed KB update fixed the issue. ( in the past issues with Office, BSOD, Crashes, etc)
Did you by chance go to your video card manufacturer and see if they have an updated video driver for your specific card? Sometimes again, a newer version can cause issues with video and you would have to revert back to an older version. I typically keep 3 versions of my video drivers in case I find out an issue later on.
Here are some links for 2 of the video card manufacturers:
nVidia : https://www.nvidia.com/Download/index.aspx?lang=en-us
AMD/ATI : https://support.amd.com/en-us/download
***
Regarding your screenshot I did not notice earlier:
Since I am still using Windows 7 x64 I follow this:
Here are some KB’s I do not allow to be installed because they will 1) Try to install / Update Windows 10 without asking me 2) Allow Microsoft to spy on me similar to what they are doing under Windows 10
This is in no way an official list, just my list I put together from various sources on the Internet:
KB3035583 9-5-2015 Update for Windows 7 x64
KB3022345
KB3075249
KB3080149
KB3068708
KB2952664
KB2976978
KB2977759
KB3123862 – New as of Jan/Feb 2016
KB3139929 – New as of 3-10-2016. This IE updates deploys another KB3146449 which brings Ads to your IE browser! Almost like a Trojan Horse!!!! (my opinion)
Keywords to look for that should tip you off that you most likely will NEED to disable this update if you want to keep Windows 7:
Telemetry
Compatibility Update for upgrading
Get Windows 10 App
Windows 10 Diagnostics Compatibility
****
Hopefully something works for you. I would try the Video Drivers first, then worry about the KB’s I listed above later.
– – – – –
FixitMad